Which one of the following basic patterns of demand is difficult to predict because it is affected by national or international events or because of a lack of demand history reflecting the stages of demand from product development to decline? A) horizontal B) seasonal C) random D) cyclical

D) cyclical

Explanation:

The cyclic demands that vary over the times and in responses to the some effects of the span of the business and demand for the electricity and the Christmas are cyclonic and the term   for the housing is affected by the business cycles upon the interest rates.Thus sensitive to the business and high in periods of economic prosperity. This reflects the lack of the history of the demand in the stages of the development.